Global Brass and Copper Holdings, Inc. (the “Company”) (NYSE: BRSS) today announced the commencement of an underwritten public offering of 3,750,000 shares of its common stock by Halkos Holdings, LLC, an affiliate of KPS Capital Partners, LP. The Company will not receive any proceeds from the offering. The total number of shares of the Company’s common stock outstanding will not change as a result of the offering. Morgan Stanley & Co. LLC is acting as the sole underwriter for the offering. A registration statement relating to these securities has been filed and declared effective with the U.S. Securities and Exchange Commission (“SEC”). This press release does not constitute an offer to sell or a solicitation of an offer to buy the securities described above, nor shall there be any sale of such shares of common stock in any state or jurisdiction in which such offer, solicitation, or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction. The offering of these securities is being made only by means of a prospectus, copies of which may be obtained from the office of the underwriter: Morgan Stanley & Co. LLC, Attention: Prospectus Department, 180 Varick Street, 2nd Floor, New York, New York 10014. About Global Brass and Copper Holdings, Inc. The Company is a leading, value-added converter, fabricator, distributor and processor of specialized copper and brass products in North America. It engages in metal melting and casting, rolling, drawing, extruding and stamping to fabricate finished and semi-finished alloy products from processed scrap, copper cathode and other refined metals. The Company’s products include a wide range of sheet, strip, foil, rod, tube and fabricated metal component products that are sold under the Olin Brass, Chase Brass and A.J. Oster brand names. The Company’s products are used in a variety of applications across diversified end markets, including the building and housing, munitions, automotive, transportation, coinage, electronics/electrical components, industrial machinery and equipment and general consumer end markets. It accesses these end markets through direct mill sales, its captive distribution network and third-party distributors.